Maybe the PARF way. 
The right rear is down into the wear-bars. The left rear is a 64th or less away from that point. The fronts have a 32nd or so left. All 4 get replaced. I can't see running with different types of tires.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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